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I haven’t seen any videos walking through the process of plate & case foaming, but it is very straight forward. If you buy foam stock yourself it’s just a matter of cutting the sheet to size for the plate/PCB combo you’re using with some nice big & sharp scissors. Then using a plate as a template & an exacto knife as the tool to cut out the switch & stabilizers openings.
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EVA & neoprene foam is the best choice for foams & sorbothane is the best choice for a butyl type sheet.
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Some are, but I advise to stay away from them since you will find yourself switch foams between cases & builds.
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Amazon like always, don’t think there is anything legal to sell you can’t find there TBH, LOL! https://www.amazon.com/s?k=EVA+foam+sheets&ref=nb_sb_noss_2
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Personally I love using sound dampening on all my boards. It removes most if not all pinging & unwanted noises, give keystrokes a slightly deeper sounds, & just all around make yout KB sound better IMHO.
The only big advice I have for buying any sound dampening material is be sure to order the proper thickness. You need to have a slight compression between the parts & sound dampening material, but just a slight compression. Too much & it also negatively impacts the sound dampening materials performance. Hope this info helps some!